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The following Oops is encountered when blk_mq is enabled with the cxlflash driver: [ 2960.817172] Oops: Kernel access of bad area, sig: 11 [#5] [ 2960.817309] NIP __blk_mq_run_hw_queue+0x278/0x4c0 [ 2960.817313] LR __blk_mq_run_hw_queue+0x2bc/0x4c0 [ 2960.817314] Call Trace: [ 2960.817320] __blk_mq_run_hw_queue+0x2bc/0x4c0 (unreliable) [ 2960.817324] blk_mq_run_hw_queue+0xd8/0x100 [ 2960.817329] blk_mq_insert_requests+0x14c/0x1f0 [ 2960.817333] blk_mq_flush_plug_list+0x150/0x190 [ 2960.817338] blk_flush_plug_list+0x11c/0x2b0 [ 2960.817344] blk_finish_plug+0x58/0x80 [ 2960.817348] __do_page_cache_readahead+0x1c0/0x2e0 [ 2960.817352] force_page_cache_readahead+0x68/0xd0 [ 2960.817356] generic_file_read_iter+0x43c/0x6a0 [ 2960.817359] blkdev_read_iter+0x68/0xa0 [ 2960.817361] __vfs_read+0x11c/0x180 [ 2960.817364] vfs_read+0xa4/0x1c0 [ 2960.817366] SyS_read+0x6c/0x110 [ 2960.817369] system_call+0x38/0xb4 The SCSI blk_mq stack assumes that sg_tablesize is always a non-zero value with scsi_mq_setup_tags() allocating tags using sg_tablesize. The cxlflash driver currently uses SG_NONE (0) for the sg_tablesize as the devices it supports are not capable of scatter gather. This mismatch of values results in the Oops above. To resolve this issue, sg_tablesize for cxlflash can simply be set to 1, a value which satisfies the constraints in cxlflash and the lack of support of SG_NONE in SCSI blk_mq. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| .. | ||
| common.h | ||
| Kconfig | ||
| lunmgt.c | ||
| main.c | ||
| main.h | ||
| Makefile | ||
| sislite.h | ||
| superpipe.c | ||
| superpipe.h | ||
| vlun.c | ||
| vlun.h | ||