From de55acd100993c70bb7c5ca9473b59cdc4debb20 Mon Sep 17 00:00:00 2001 From: Peter Robinson Date: Mon, 2 Nov 2015 02:20:20 +0000 Subject: watchdog: omap_wdt: fix null pointer dereference Fix issue from two patches overlapping causing a kernel oops [ 3569.297449] Unable to handle kernel NULL pointer dereference at virtual address 00000088 [ 3569.306272] pgd = dc894000 [ 3569.309287] [00000088] *pgd=00000000 [ 3569.313104] Internal error: Oops: 5 [#1] SMP ARM [ 3569.317986] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_filter ebtable_nat ebtable_broute bridge stp llc ebtables ip6table_security ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_filter ip6_tables iptable_security iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle musb_dsps cppi41 musb_hdrc phy_am335x udc_core phy_generic phy_am335x_control omap_sham omap_aes omap_rng omap_hwspinlock omap_mailbox hwspinlock_core musb_am335x omap_wdt at24 8250_omap leds_gpio cpufreq_dt smsc davinci_mdio mmc_block ti_cpsw cpsw_common ptp pps_core cpsw_ale davinci_cpdma omap_hsmmc omap_dma mmc_core i2c_dev [ 3569.386293] CPU: 0 PID: 1429 Comm: wdctl Not tainted 4.3.0-0.rc7.git0.1.fc24.armv7hl #1 [ 3569.394740] Hardware name: Generic AM33XX (Flattened Device Tree) [ 3569.401179] task: dbd11a00 ti: dbaac000 task.ti: dbaac000 [ 3569.406917] PC is at omap_wdt_get_timeleft+0xc/0x20 [omap_wdt] [ 3569.413106] LR is at watchdog_ioctl+0x3cc/0x42c [ 3569.417902] pc : [] lr : [] psr: 600f0013 [ 3569.417902] sp : dbaadf18 ip : 00000003 fp : 7f5d3bbe [ 3569.430014] r10: 00000000 r9 : 00000003 r8 : bef21ab8 [ 3569.435535] r7 : dbbc0f7c r6 : dbbc0f18 r5 : bef21ab8 r4 : 00000000 [ 3569.442427] r3 : 00000000 r2 : 00000000 r1 : 8004570a r0 : dbbc0f18 [ 3569.449323] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 3569.456858] Control: 10c5387d Table: 9c894019 DAC: 00000051 [ 3569.462927] Process wdctl (pid: 1429, stack limit = 0xdbaac220) [ 3569.469179] Stack: (0xdbaadf18 to 0xdbaae000) [ 3569.473790] df00: bef21ab8 dbf60e38 [ 3569.482441] df20: dc91b840 8004570a bef21ab8 c03988a4 dbaadf48 dc854000 00000000 dd313850 [ 3569.491092] df40: ddf033b8 0000570a dc91b80b dbaadf3c dbf60e38 00000020 c0df9250 c0df6c48 [ 3569.499741] df60: dc91b840 8004570a 00000000 dc91b840 dc91b840 8004570a bef21ab8 00000003 [ 3569.508389] df80: 00000000 c03989d4 bef21b74 7f5d3bad 00000003 00000036 c020fcc4 dbaac000 [ 3569.517037] dfa0: 00000000 c020fb00 bef21b74 7f5d3bad 00000003 8004570a bef21ab8 00000001 [ 3569.525685] dfc0: bef21b74 7f5d3bad 00000003 00000036 00000001 00000000 7f5e4eb0 7f5d3bbe [ 3569.534334] dfe0: 7f5e4f10 bef21a3c 7f5d0a54 b6e97e0c a00f0010 00000003 00000000 00000000 [ 3569.543038] [] (omap_wdt_get_timeleft [omap_wdt]) from [] (watchdog_ioctl+0x3cc/0x42c) [ 3569.553266] [] (watchdog_ioctl) from [] (do_vfs_ioctl+0x5bc/0x698) [ 3569.561648] [] (do_vfs_ioctl) from [] (SyS_ioctl+0x54/0x7c) [ 3569.569400] [] (SyS_ioctl) from [] (ret_fast_syscall+0x0/0x3c) [ 3569.577413] Code: e12fff1e e52de004 e8bd4000 e5903060 (e5933088) [ 3569.584089] ---[ end trace cec3039bd3ae610a ]--- Cc: # v4.2+ Signed-off-by: Peter Robinson Acked-by: Lars Poeschel Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/omap_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index d96bee017fd3..6f17c935a6cf 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -205,7 +205,7 @@ static int omap_wdt_set_timeout(struct watchdog_device *wdog, static unsigned int omap_wdt_get_timeleft(struct watchdog_device *wdog) { - struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog); + struct omap_wdt_dev *wdev = to_omap_wdt_dev(wdog); void __iomem *base = wdev->base; u32 value; -- cgit From b647d4297234e7f5456c16635ca0cdd82b7055db Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Sat, 17 Oct 2015 21:28:16 +0300 Subject: watchdog: pnx4008: fix warnings caused by enabling unprepared clock If common clock framework is configured, the driver generates a warning, which is fixed by this change: WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:727 clk_core_enable+0x2c/0xa4() Modules linked in: CPU: 0 PID: 1 Comm: swapper Tainted: G W 4.3.0-rc2+ #171 Hardware name: LPC32XX SoC (Flattened Device Tree) Backtrace: [<>] (dump_backtrace) from [<>] (show_stack+0x18/0x1c) [<>] (show_stack) from [<>] (dump_stack+0x20/0x28) [<>] (dump_stack) from [<>] (warn_slowpath_common+0x90/0xb8) [<>] (warn_slowpath_common) from [<>] (warn_slowpath_null+0x24/0x2c) [<>] (warn_slowpath_null) from [<>] (clk_core_enable+0x2c/0xa4) [<>] (clk_core_enable) from [<>] (clk_enable+0x24/0x38) [<>] (clk_enable) from [<>] (pnx4008_wdt_probe+0x78/0x11c) [<>] (pnx4008_wdt_probe) from [<>] (platform_drv_probe+0x50/0xa0) [<>] (platform_drv_probe) from [<>] (driver_probe_device+0x18c/0x408) [<>] (driver_probe_device) from [<>] (__driver_attach+0x70/0x94) [<>] (__driver_attach) from [<>] (bus_for_each_dev+0x74/0x98) [<>] (bus_for_each_dev) from [<>] (driver_attach+0x20/0x28) [<>] (driver_attach) from [<>] (bus_add_driver+0x11c/0x248) [<>] (bus_add_driver) from [<>] (driver_register+0xa4/0xe8) [<>] (driver_register) from [<>] (__platform_driver_register+0x50/0x64) [<>] (__platform_driver_register) from [<>] (platform_wdt_driver_init+0x18/0x20) [<>] (platform_wdt_driver_init) from [<>] (do_one_initcall+0x11c/0x1dc) [<>] (do_one_initcall) from [<>] (kernel_init_freeable+0x10c/0x1d4) [<>] (kernel_init_freeable) from [<>] (kernel_init+0x10/0xec) [<>] (kernel_init) from [<>] (ret_from_fork+0x14/0x24) Signed-off-by: Vladimir Zapolskiy Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/pnx4008_wdt.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c index 4224b3ec83a5..35319a49d01a 100644 --- a/drivers/watchdog/pnx4008_wdt.c +++ b/drivers/watchdog/pnx4008_wdt.c @@ -161,7 +161,7 @@ static int pnx4008_wdt_probe(struct platform_device *pdev) if (IS_ERR(wdt_clk)) return PTR_ERR(wdt_clk); - ret = clk_enable(wdt_clk); + ret = clk_prepare_enable(wdt_clk); if (ret) return ret; @@ -184,7 +184,7 @@ static int pnx4008_wdt_probe(struct platform_device *pdev) return 0; disable_clk: - clk_disable(wdt_clk); + clk_disable_unprepare(wdt_clk); return ret; } @@ -192,7 +192,7 @@ static int pnx4008_wdt_remove(struct platform_device *pdev) { watchdog_unregister_device(&pnx4008_wdd); - clk_disable(wdt_clk); + clk_disable_unprepare(wdt_clk); return 0; } -- cgit From 4c30737ce16612b0f3b840a7c9928385cbb67555 Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Wed, 28 Oct 2015 02:55:35 +0200 Subject: watchdog: pnx4008: make global wdt_clk static Silences sparse warning: drivers/watchdog/pnx4008_wdt.c:83:25: warning: symbol 'wdt_clk' was not declared. Should it be static? Signed-off-by: Vladimir Zapolskiy Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/pnx4008_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c index 35319a49d01a..313cd1c6fda0 100644 --- a/drivers/watchdog/pnx4008_wdt.c +++ b/drivers/watchdog/pnx4008_wdt.c @@ -80,7 +80,7 @@ static unsigned int heartbeat = DEFAULT_HEARTBEAT; static DEFINE_SPINLOCK(io_lock); static void __iomem *wdt_base; -struct clk *wdt_clk; +static struct clk *wdt_clk; static int pnx4008_wdt_start(struct watchdog_device *wdd) { -- cgit From 62ed853c7de7a77bdf01421fb6836269c9b1aa1f Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 6 Nov 2015 12:56:31 +0300 Subject: watchdog: w83977f_wdt: underflow in wdt_set_timeout() "t" is controlled by the user. If "t" is a very large integer then it could lead to a negative "tmrval". We cap the upper bound of "tmrval" but, in the current code, we allow negatives. This is a bug and it causes a static checker warning. Let's make "tmrval" unsigned to avoid this problem. Signed-off-by: Dan Carpenter Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/w83977f_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/watchdog/w83977f_wdt.c b/drivers/watchdog/w83977f_wdt.c index 91bf55a20024..20e2bba10400 100644 --- a/drivers/watchdog/w83977f_wdt.c +++ b/drivers/watchdog/w83977f_wdt.c @@ -224,7 +224,7 @@ static int wdt_keepalive(void) static int wdt_set_timeout(int t) { - int tmrval; + unsigned int tmrval; /* * Convert seconds to watchdog counter time units, rounding up. -- cgit From 0879eee13f9cf79793ce88fb41bf0dd2a51093c0 Mon Sep 17 00:00:00 2001 From: Andrew Chew Date: Mon, 9 Nov 2015 16:11:38 -0800 Subject: watchdog: tegra: Stop watchdog first if restarting If we need to restart the watchdog due to someone changing the timeout interval, stop the watchdog before restarting it. Otherwise, the new timeout doesn't seem to take. Signed-off-by: Andrew Chew Reviewed-by: Thierry Reding Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/tegra_wdt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/watchdog/tegra_wdt.c b/drivers/watchdog/tegra_wdt.c index 7f97cdd53f29..9ec57608da82 100644 --- a/drivers/watchdog/tegra_wdt.c +++ b/drivers/watchdog/tegra_wdt.c @@ -140,8 +140,10 @@ static int tegra_wdt_set_timeout(struct watchdog_device *wdd, { wdd->timeout = timeout; - if (watchdog_active(wdd)) + if (watchdog_active(wdd)) { + tegra_wdt_stop(wdd); return tegra_wdt_start(wdd); + } return 0; } -- cgit From 646251a59c73253a7a2c7b1d6adbedd2292390a0 Mon Sep 17 00:00:00 2001 From: Shaohui Xie Date: Tue, 17 Nov 2015 17:53:19 +0800 Subject: watchdog: Add support for Freescale Layerscape platforms Modify watchdog/Kconfig file to support Layerscape platforms. Signed-off-by: Shaohui Xie Signed-off-by: Hou Zhiqiang Acked-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 7a8a6c6952e9..1c427beffadd 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -446,7 +446,7 @@ config MAX63XX_WATCHDOG config IMX2_WDT tristate "IMX2+ Watchdog" - depends on ARCH_MXC + depends on ARCH_MXC || ARCH_LAYERSCAPE select REGMAP_MMIO select WATCHDOG_CORE help -- cgit From 5da2bf1ac8fbe701a138efb340b9f2ef26c10ed7 Mon Sep 17 00:00:00 2001 From: Nicolas Boichat Date: Wed, 18 Nov 2015 10:45:01 +0800 Subject: watchdog: mtk_wdt: Use MODE_KEY when stopping the watchdog WDT_MODE value need to be or-ed with MODE_KEY when setting watchdog mode. Add it to mtk_wdt_stop function, so that the watchdog can be stopped (e.g. during suspend). Signed-off-by: Nicolas Boichat Acked-by: Matthias Brugger Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/mtk_wdt.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers') diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 6ad9df948711..b751f43d76ed 100644 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -123,6 +123,7 @@ static int mtk_wdt_stop(struct watchdog_device *wdt_dev) reg = readl(wdt_base + WDT_MODE); reg &= ~WDT_MODE_EN; + reg |= WDT_MODE_KEY; iowrite32(reg, wdt_base + WDT_MODE); return 0; -- cgit