Subject: + hpsa-return-0-from-driver-probe-function-on-success-not-1.patch added to -mm tree To: scameron@xxxxxxxxxxxxxxxxxx,axboe@xxxxxxxxx,stable@xxxxxxxxxxxxxxx From: akpm@xxxxxxxxxxxxxxxxxxxx Date: Fri, 01 Nov 2013 12:28:48 -0700 The patch titled Subject: hpsa: return 0 from driver probe function on success, not 1 has been added to the -mm tree. Its filename is hpsa-return-0-from-driver-probe-function-on-success-not-1.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/hpsa-return-0-from-driver-probe-function-on-success-not-1.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/hpsa-return-0-from-driver-probe-function-on-success-not-1.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx> Subject: hpsa: return 0 from driver probe function on success, not 1 A return value of 1 is interpreted as an error. See pci_driver. in local_pci_probe(). If you're wondering how this ever could have worked, it's because it used to be the case that only return values less than zero were interpreted as failure. But even in the current kernel if the driver registers its various entry points with the kernel, and then returns a value which is interpreted as failure, those registrations aren't undone, so the driver still mostly works. However, the driver's remove function wouldn't be called on rmmod, and pci power management functions wouldn't work. In the case of Smart Array, since it has a battery backed cache (or else no cache) even if the driver is not shut down properly as long as there is no outstanding i/o, nothing too bad happens, which is why it took so long to notice. Requesting backport to stable because the change to pci-driver.c which requires driver probe functions to return 0 occurred between 2.6.35 and 2.6.36 (the pci power management breakage) and again between 3.7 and 3.8 (pci_dev->driver getting set to NULL in local_pci_probe() preventing driver remove function from being called on rmmod.) Signed-off-by: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/scsi/hpsa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/scsi/hpsa.c~hpsa-return-0-from-driver-probe-function-on-success-not-1 drivers/scsi/hpsa.c --- a/drivers/scsi/hpsa.c~hpsa-return-0-from-driver-probe-function-on-success-not-1 +++ a/drivers/scsi/hpsa.c @@ -4926,7 +4926,7 @@ reinit_after_soft_reset: hpsa_hba_inquiry(h); hpsa_register_scsi(h); /* hook ourselves into SCSI subsystem */ start_controller_lockup_detector(h); - return 1; + return 0; clean4: hpsa_free_sg_chain_blocks(h); _ Patches currently in -mm which might be from scameron@xxxxxxxxxxxxxxxxxx are hpsa-return-0-from-driver-probe-function-on-success-not-1.patch drivers-block-ccissc-return-0-from-driver-probe-function-on-success-not-1.patch drivers-block-ccissc-cciss_init_one-use-proper-errnos.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html