diff options
| author |   Will Deacon <will.deacon@arm.com> | 2019-02-22 17:14:59 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-08 12:01:02 +0100 |
| commit | fb24ea52f78e0d595852e09e3a55697c8f442189 (patch) | |
| tree | 00ca29c7b0b8df6258a1ad1faf34f6e838ada26c /drivers/misc | |
| parent | drivers: Remove useless trailing comments from mmiowb() invocations (diff) | |
| download | wireguard-linux-fb24ea52f78e0d595852e09e3a55697c8f442189.tar.xz wireguard-linux-fb24ea52f78e0d595852e09e3a55697c8f442189.zip | |
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 <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/ioc4.c | 2 | ||||
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 3 | ||||
| -rw-r--r-- | drivers/misc/tifm_7xx1.c | 1 |
3 files changed, 0 insertions, 6 deletions
diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c index ec0832278170..9d0445a567db 100644 --- a/drivers/misc/ioc4.c +++ b/drivers/misc/ioc4.c @@ -156,7 +156,6 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd) /* Reset to power-on state */ writel(0, &idd->idd_misc_regs->int_out.raw); - mmiowb(); /* Set up square wave */ int_out.raw = 0; @@ -164,7 +163,6 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd) int_out.fields.mode = IOC4_INT_OUT_MODE_TOGGLE; int_out.fields.diag = 0; writel(int_out.raw, &idd->idd_misc_regs->int_out.raw); - mmiowb(); /* Check square wave period averaged over some number of cycles */ start = ktime_get_ns(); diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 3fbbadfa2ae1..8a47a6fc3fc7 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -350,9 +350,6 @@ static void mei_me_hw_reset_release(struct mei_device *dev) hcsr |= H_IG; hcsr &= ~H_RST; mei_hcsr_set(dev, hcsr); - - /* complete this write before we set host ready on another CPU */ - mmiowb(); } /** diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c index 9ac95b48ef92..cc729f7ab32e 100644 --- a/drivers/misc/tifm_7xx1.c +++ b/drivers/misc/tifm_7xx1.c @@ -403,7 +403,6 @@ static void tifm_7xx1_remove(struct pci_dev *dev) fm->eject = tifm_7xx1_dummy_eject; fm->has_ms_pif = tifm_7xx1_dummy_has_ms_pif; writel(TIFM_IRQ_SETALL, fm->addr + FM_CLEAR_INTERRUPT_ENABLE); - mmiowb(); free_irq(dev->irq, fm); tifm_remove_adapter(fm); |