From fb24ea52f78e0d595852e09e3a55697c8f442189 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 22 Feb 2019 17:14:59 +0000 Subject: drivers: Remove explicit invocations of mmiowb() mmiowb() is now implied by spin_unlock() on architectures that require it, so there is no reason to call it from driver code. This patch was generated using coccinelle: @mmiowb@ @@ - mmiowb(); and invoked as: $ for d in drivers include/linux/qed sound; do \ spatch --include-headers --sp-file mmiowb.cocci --dir $d --in-place; done NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. If you've ended up bisecting to this commit, you can reintroduce the mmiowb() calls using wmb() instead, which should restore the old behaviour on all architectures other than some esoteric ia64 systems. Acked-by: Linus Torvalds Signed-off-by: Will Deacon --- drivers/infiniband/hw/qib/qib_sd7220.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'drivers/infiniband/hw/qib/qib_sd7220.c') diff --git a/drivers/infiniband/hw/qib/qib_sd7220.c b/drivers/infiniband/hw/qib/qib_sd7220.c index 12caf3db8c34..4f4a09c2dbcd 100644 --- a/drivers/infiniband/hw/qib/qib_sd7220.c +++ b/drivers/infiniband/hw/qib/qib_sd7220.c @@ -1068,7 +1068,6 @@ static int qib_sd_setvals(struct qib_devdata *dd) for (idx = 0; idx < NUM_DDS_REGS; ++idx) { data = ((dds_reg_map & 0xF) << 4) | TX_FAST_ELT; writeq(data, iaddr + idx); - mmiowb(); qib_read_kreg32(dd, kr_scratch); dds_reg_map >>= 4; for (midx = 0; midx < DDS_ROWS; ++midx) { @@ -1076,7 +1075,6 @@ static int qib_sd_setvals(struct qib_devdata *dd) data = dds_init_vals[midx].reg_vals[idx]; writeq(data, daddr); - mmiowb(); qib_read_kreg32(dd, kr_scratch); } /* End inner for (vals for this reg, each row) */ } /* end outer for (regs to be stored) */ @@ -1098,13 +1096,11 @@ static int qib_sd_setvals(struct qib_devdata *dd) didx = idx + min_idx; /* Store the next RXEQ register address */ writeq(rxeq_init_vals[idx].rdesc, iaddr + didx); - mmiowb(); qib_read_kreg32(dd, kr_scratch); /* Iterate through RXEQ values */ for (vidx = 0; vidx < 4; vidx++) { data = rxeq_init_vals[idx].rdata[vidx]; writeq(data, taddr + (vidx << 6) + idx); - mmiowb(); qib_read_kreg32(dd, kr_scratch); } } /* end outer for (Reg-writes for RXEQ) */ -- cgit v1.2.3-59-g8ed1b