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| author | Paolo Abeni <pabeni@redhat.com> | 2022-09-08 19:34:54 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2022-09-08 19:38:30 +0300 |
| commit | 9f8f1933dce555d3c246f447f54fca8de8889da9 (patch) | |
| tree | dc447d0174473de8385d47eb8aedc058a336e4a9 /include/linux/buffer_head.h | |
| parent | 75554fe00f941c3c3d9344e88708093a14d2b4b8 (diff) | |
| parent | 26b1224903b3fb66e8aa564868d0d57648c32b15 (diff) | |
| download | linux-9f8f1933dce555d3c246f447f54fca8de8889da9.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
drivers/net/ethernet/freescale/fec.h
7d650df99d52 ("net: fec: add pm_qos support on imx6q platform")
40c79ce13b03 ("net: fec: add stop mode support for imx8 platform")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include/linux/buffer_head.h')
| -rw-r--r-- | include/linux/buffer_head.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 089c9ade4325..df518c429667 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -138,6 +138,17 @@ BUFFER_FNS(Defer_Completion, defer_completion) static __always_inline void set_buffer_uptodate(struct buffer_head *bh) { /* + * If somebody else already set this uptodate, they will + * have done the memory barrier, and a reader will thus + * see *some* valid buffer state. + * + * Any other serialization (with IO errors or whatever that + * might clear the bit) has to come from other state (eg BH_Lock). + */ + if (test_bit(BH_Uptodate, &bh->b_state)) + return; + + /* * make it consistent with folio_mark_uptodate * pairs with smp_load_acquire in buffer_uptodate */ |