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authorIoan Nicu <ioan.nicu.ext@nokia.com>2017-10-03 16:15:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-03 17:54:24 -0700
commit31d1e130f4a0f8f629a460167569577cac9b17c1 (patch)
treeea592c410053b35919ddbd5b116480598e6d957b /mm/rodata_test.c
parent57148a64e823bb1f49112fa52a92a7f372cda892 (diff)
rapidio: remove global irq spinlocks from the subsystem
Locking of config and doorbell operations should be done only if the underlying hardware requires it. This patch removes the global spinlocks from the rapidio subsystem and moves them to the mport drivers (fsl_rio and tsi721), only to the necessary places. For example, local config space read and write operations (lcread/lcwrite) are atomic in all existing drivers, so there should be no need for locking, while the cread/cwrite operations which generate maintenance transactions need to be synchronized with a lock. Later, each driver could chose to use a per-port lock instead of a global one, or even more granular locking. Link: http://lkml.kernel.org/r/20170824113023.GD50104@nokia.com Signed-off-by: Ioan Nicu <ioan.nicu.ext@nokia.com> Signed-off-by: Frank Kunz <frank.kunz@nokia.com> Acked-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rodata_test.c')
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