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authorJohn W. Linville <linville@tuxdriver.com>2010-03-31 21:39:35 +0200
committerJohn W. Linville <linville@tuxdriver.com>2010-04-26 13:50:54 -0400
commitd53cdbb94a52a920d5420ed64d986c3523a56743 (patch)
tree39b1026c953de14ce6b14417cf9bcb66992909f0 /drivers/ssb/pci.c
parent672724403b42da1d276c6cf811e8e34d15efd964 (diff)
ssb: do not read SPROM if it does not exist
Attempting to read registers that don't exist on the SSB bus can cause hangs on some boxes. At least some b43 devices are 'in the wild' that don't have SPROMs at all. When the SSB bus support loads, it attempts to read these (non-existant) SPROMs and causes hard hangs on the box -- no console output, etc. This patch adds some intelligence to determine whether or not the SPROM is present before attempting to read it. This avoids those hard hangs on those devices with no SPROM attached to their SSB bus. The SSB-attached devices (e.g. b43, et al.) won't work, but at least the box will survive to test further patches. :-) Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: Michael Buesch <mb@bu3sch.de>
Diffstat (limited to 'drivers/ssb/pci.c')
-rw-r--r--drivers/ssb/pci.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index 9e50896233aa..a4b2b99f2c80 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -620,6 +620,11 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
int err = -ENOMEM;
u16 *buf;
+ if (!ssb_is_sprom_available(bus)) {
+ ssb_printk(KERN_ERR PFX "No SPROM available!\n");
+ return -ENODEV;
+ }
+
buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
if (!buf)
goto out;