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staging: lustre: kg_sem semaphore handling is incorrectly

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During the removal of the cfs wrappers the kg_sem semaphore
was handled incorrectly. We need to take a write lock when
writing data to the kkuc_groups. The libcfs_kkuc_group_foreach
needs to only take a read lock. This makes use match the
OpenSFS development branch.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Simmons
2015-12-23 16:24:40 -05:00
committed by Greg Kroah-Hartman
parent 8b88bcabca
commit 50a10043fd
1 changed files with 4 additions and 4 deletions
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8
drivers/staging/lustre/lustre/libcfs/kernel_user_comm.c
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@@ -186,7 +186,7 @@ int libcfs_kkuc_group_put(int group, void *payload)
int rc = 0;
int one_success = 0;
down_read(&kg_sem);
down_write(&kg_sem);
list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
if (reg->kr_fp != NULL) {
rc = libcfs_kkuc_msg_put(reg->kr_fp, payload);
@@ -198,7 +198,7 @@ int libcfs_kkuc_group_put(int group, void *payload)
}
}
}
up_read(&kg_sem);
up_write(&kg_sem);
/* don't return an error if the message has been delivered
* at least to one agent */
@@ -230,12 +230,12 @@ int libcfs_kkuc_group_foreach(int group, libcfs_kkuc_cb_t cb_func,
if (kkuc_groups[group].next == NULL)
return 0;
down_write(&kg_sem);
down_read(&kg_sem);
list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
if (reg->kr_fp != NULL)
rc = cb_func(reg->kr_data, cb_arg);
}
up_write(&kg_sem);
up_read(&kg_sem);
return rc;
}