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authorGuilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>2016-06-15 00:22:41 +0300
committerJens Axboe <axboe@fb.com>2016-07-12 18:23:00 +0300
commit54adc01055b75ec8769c5a36574c7a0895c0c0b2 (patch)
tree66500615cef7fe97053344365b1abe3a5e89eb38 /Documentation/ioctl
parent41d512e51b5e59ee2598f74249799dcc6b0a06f2 (diff)
downloadlinux-54adc01055b75ec8769c5a36574c7a0895c0c0b2.tar.xz
nvme/quirk: Add a delay before checking for adapter readiness
When disabling the controller, the specification says the register NVME_REG_CC should be written and then driver needs to wait the adapter to be ready, which is checked by reading another register bit (NVME_CSTS_RDY). There's a timeout validation in this checking, so in case this timeout is reached the driver gives up and removes the adapter from the system. After a firmware activation procedure, the PCI_DEVICE(0x1c58, 0x0003) (HGST adapter) end up being removed if we issue a reset_controller, because driver keeps verifying the NVME_REG_CSTS until the timeout is reached. This patch adds a necessary quirk for this adapter, by introducing a delay before nvme_wait_ready(), so the reset procedure is able to be completed. This quirk is needed because just increasing the timeout is not enough in case of this adapter - the driver must wait before start reading NVME_REG_CSTS register on this specific device. Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
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