https://github.com/torvalds/linux
Revision e738455b2c6dcdab03e45d97de36476f93f557d2 authored by Wen Gu on 20 September 2022, 06:43:09 UTC, committed by Paolo Abeni on 22 September 2022, 10:53:53 UTC
There might be a potential race between SMC-R buffer map and
link group termination.
smc_smcr_terminate_all() | smc_connect_rdma()
--------------------------------------------------------------
| smc_conn_create()
for links in smcibdev |
schedule links down |
| smc_buf_create()
| \- smcr_buf_map_usable_links()
| \- no usable links found,
| (rmb->mr = NULL)
|
| smc_clc_send_confirm()
| \- access conn->rmb_desc->mr[]->rkey
| (panic)
During reboot and IB device module remove, all links will be set
down and no usable links remain in link groups. In such situation
smcr_buf_map_usable_links() should return an error and stop the
CLC flow accessing to uninitialized mr.
Fixes: b9247544c1bc ("net/smc: convert static link ID instances to support multiple links")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Link: https://lore.kernel.org/r/1663656189-32090-1-git-send-email-guwen@linux.alibaba.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
1 parent 624aea6
Tip revision: e738455b2c6dcdab03e45d97de36476f93f557d2 authored by Wen Gu on 20 September 2022, 06:43:09 UTC
net/smc: Stop the CLC flow if no link to map buffers on
net/smc: Stop the CLC flow if no link to map buffers on
Tip revision: e738455
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| .clang-format | -rw-r--r-- | 19.9 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 151 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.9 KB |
| .mailmap | -rw-r--r-- | 23.7 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 99.1 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 664.3 KB |
| Makefile | -rw-r--r-- | 64.5 KB |
| README | -rw-r--r-- | 727 bytes |
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