tree 4222a7d89b66f6a730799382f006e84cfc307530
parent 48cb953e6d899f2b0fb38c8b69c260929107ad4c
parent fce8dc5e50e44d8f644e0f7854e6d7d518fedb68
author Arnd Bergmann <arnd@arndb.de> 1501844081 +0200
committer Arnd Bergmann <arnd@arndb.de> 1501844081 +0200
mergetag object fce8dc5e50e44d8f644e0f7854e6d7d518fedb68
 type commit
 tag renesas-fixes3-for-v4.13
 tagger Simon Horman <horms@verge.net.au> 1501499129 +0200
 
 Third Round of Renesas ARM Based SoC Fixes for v4.13
 
 Fix deadlock in regulator quirk for R-Car Gen 2 SoCs
 
 The da9063/da9210 regulator quirk for R-Car Gen2 boards uses a bus
 notifier, and unregisters the notifier when it is no longer needed.
 However, a notifier must not be unregistered from within the call chain.
 
 This bug went unnoticed, as blocking_notifier_chain_unregister() didn't
 take the semaphore during early boot. This is no longer the case as of
 upstream commit 1c3c5eab171590f8 ("sched/core: Enable might_sleep() and
 smp_processor_id() checks early") and a deadlock occurs.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJZfw75AAoJENfPZGlqN0++i24P/j38Z5LKt529CBT2uPgdiIr7
 lWEzU3Dgij/vPBUevz1s+hPa2i4jH1sfeKjSd2Ild3Ac+qAy6AwnzWlVYBCaBhlJ
 qFAsr3nZ6ybftdA4rIJb1pWF+ugG7uNcQ3S0J5vLeiRU5HC/ZR+Ar+hjeuDwwIGa
 889tI5UpKDFxYzkLIDVyiW0gX7WFhmxML0jptuV6c7bSl4Td/RxaP25Hcq8MsApv
 oVre7mWPBKrIrjH26lPIUmdN4SGIHgUS3k2j9fFoWit9p2gYX6WDVbHjgALzPL1r
 2Su8mSuP6ijutrrOuoB3OaNRlTaSr1Jpzfb6m6xRY+y1Anks0FxRVd712HrxinZK
 4xW0ebUpfxpFsg8lJGoe1d1FGOSuj6A3/5GCrA+fQS0LSKthft+ovHmKBAogbSm3
 7uCCU/h05LIkW0kDZYNjUqPWi+FwHZ4nEZEJiXMBt5DOyWpF5oIjCFeHmyp8VruI
 xHZnq0pcck0Y+OSln2tiV43kw4QzK3BjTZZRc/IkVf19m24y+WJu9KfXTQhCDeLt
 g4/zjAZrZddVQPtUz0f1YC07gPTmxLQpQJqLZBNeaed2W8p+tmUWUuoILpjPjEqR
 Uu0EQE+t205YaxEz/ctYATdrpNOM5TWRhD+U25VTfhgxar3p9aC4GNVskL/fMGUy
 /wTWYp1KVlxYjaxi3aOP
 =N5ig
 -----END PGP SIGNATURE-----

Merge tag 'renesas-fixes3-for-v4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes

Pull "Third Round of Renesas ARM Based SoC Fixes for v4.13" from Simon Horman:

Fix deadlock in regulator quirk for R-Car Gen 2 SoCs

The da9063/da9210 regulator quirk for R-Car Gen2 boards uses a bus
notifier, and unregisters the notifier when it is no longer needed.
However, a notifier must not be unregistered from within the call chain.

This bug went unnoticed, as blocking_notifier_chain_unregister() didn't
take the semaphore during early boot. This is no longer the case as of
upstream commit 1c3c5eab171590f8 ("sched/core: Enable might_sleep() and
smp_processor_id() checks early") and a deadlock occurs.

* tag 'renesas-fixes3-for-v4.13' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  ARM: shmobile: rcar-gen2: Fix deadlock in regulator quirk