| Message ID | Pine.LNX.4.64.1104152006110.18593@axis700.grange (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Apr 15, 2011 at 1:08 PM, Guennadi Liakhovetski <g.liakhovetski@gmx.de> wrote: > Currently there is a race in the MMC core between a card-detect > rescan work and the clock-gating work, scheduled from a command > completion. Fix it by removing the dedicated clock-gating mutex and > using the MMC standard locking mechanism instead. > > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> > Cc: Simon Horman <horms@verge.net.au> > Cc: Magnus Damm <damm@opensource.se> > Cc: Linus Walleij <linus.walleij@linaro.org> > --- > drivers/mmc/core/host.c | 9 ++++----- > include/linux/mmc/host.h | 1 - > 2 files changed, 4 insertions(+), 6 deletions(-) > > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c > index 461e6a1..2b200c1 100644 > --- a/drivers/mmc/core/host.c > +++ b/drivers/mmc/core/host.c > @@ -94,7 +94,7 @@ static void mmc_host_clk_gate_delayed(struct mmc_host *host) > spin_unlock_irqrestore(&host->clk_lock, flags); > return; > } > - mutex_lock(&host->clk_gate_mutex); > + mmc_claim_host(host); > spin_lock_irqsave(&host->clk_lock, flags); > if (!host->clk_requests) { > spin_unlock_irqrestore(&host->clk_lock, flags); > @@ -104,7 +104,7 @@ static void mmc_host_clk_gate_delayed(struct mmc_host *host) > pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); > } > spin_unlock_irqrestore(&host->clk_lock, flags); > - mutex_unlock(&host->clk_gate_mutex); > + mmc_release_host(host); > } > > /* > @@ -130,7 +130,7 @@ void mmc_host_clk_ungate(struct mmc_host *host) > { > unsigned long flags; > > - mutex_lock(&host->clk_gate_mutex); > + mmc_claim_host(host); > spin_lock_irqsave(&host->clk_lock, flags); > if (host->clk_gated) { > spin_unlock_irqrestore(&host->clk_lock, flags); > @@ -140,7 +140,7 @@ void mmc_host_clk_ungate(struct mmc_host *host) > } > host->clk_requests++; > spin_unlock_irqrestore(&host->clk_lock, flags); > - mutex_unlock(&host->clk_gate_mutex); > + mmc_release_host(host); > } > > /** > @@ -215,7 +215,6 @@ static inline void mmc_host_clk_init(struct mmc_host *host) > host->clk_gated = false; > INIT_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); > spin_lock_init(&host->clk_lock); > - mutex_init(&host->clk_gate_mutex); > } > > /** > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > index bcb793e..eb792cb 100644 > --- a/include/linux/mmc/host.h > +++ b/include/linux/mmc/host.h > @@ -183,7 +183,6 @@ struct mmc_host { > struct work_struct clk_gate_work; /* delayed clock gate */ > unsigned int clk_old; /* old clock value cache */ > spinlock_t clk_lock; /* lock for clk fields */ > - struct mutex clk_gate_mutex; /* mutex for clock gating */ > #endif > > /* host specific block data */ > -- > 1.7.2.5 I've looked at this when Guennadi sent the original email and it looks good to me FWIW. A -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 461e6a1..2b200c1 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -94,7 +94,7 @@ static void mmc_host_clk_gate_delayed(struct mmc_host *host) spin_unlock_irqrestore(&host->clk_lock, flags); return; } - mutex_lock(&host->clk_gate_mutex); + mmc_claim_host(host); spin_lock_irqsave(&host->clk_lock, flags); if (!host->clk_requests) { spin_unlock_irqrestore(&host->clk_lock, flags); @@ -104,7 +104,7 @@ static void mmc_host_clk_gate_delayed(struct mmc_host *host) pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); } spin_unlock_irqrestore(&host->clk_lock, flags); - mutex_unlock(&host->clk_gate_mutex); + mmc_release_host(host); } /* @@ -130,7 +130,7 @@ void mmc_host_clk_ungate(struct mmc_host *host) { unsigned long flags; - mutex_lock(&host->clk_gate_mutex); + mmc_claim_host(host); spin_lock_irqsave(&host->clk_lock, flags); if (host->clk_gated) { spin_unlock_irqrestore(&host->clk_lock, flags); @@ -140,7 +140,7 @@ void mmc_host_clk_ungate(struct mmc_host *host) } host->clk_requests++; spin_unlock_irqrestore(&host->clk_lock, flags); - mutex_unlock(&host->clk_gate_mutex); + mmc_release_host(host); } /** @@ -215,7 +215,6 @@ static inline void mmc_host_clk_init(struct mmc_host *host) host->clk_gated = false; INIT_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); spin_lock_init(&host->clk_lock); - mutex_init(&host->clk_gate_mutex); } /** diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index bcb793e..eb792cb 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -183,7 +183,6 @@ struct mmc_host { struct work_struct clk_gate_work; /* delayed clock gate */ unsigned int clk_old; /* old clock value cache */ spinlock_t clk_lock; /* lock for clk fields */ - struct mutex clk_gate_mutex; /* mutex for clock gating */ #endif /* host specific block data */
Currently there is a race in the MMC core between a card-detect rescan work and the clock-gating work, scheduled from a command completion. Fix it by removing the dedicated clock-gating mutex and using the MMC standard locking mechanism instead. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Cc: Simon Horman <horms@verge.net.au> Cc: Magnus Damm <damm@opensource.se> Cc: Linus Walleij <linus.walleij@linaro.org> --- drivers/mmc/core/host.c | 9 ++++----- include/linux/mmc/host.h | 1 - 2 files changed, 4 insertions(+), 6 deletions(-)