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bus: fsl-mc: use raw spin lock to serialize mc cmds 

Replace the spinlock that serializes the MC commands with a raw
spinlock. This is needed for the RT kernel because there are MC
commands sent in interrupt context.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Link: https://lore.kernel.org/r/20200717154800.17169-3-ioana.ciornei@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laurentiu Tudor 2020-07-17 18:47:59 +03:00 committed by Greg Kroah-Hartman
parent a3b7a58182
commit 9a872def59
3 changed files with 4 additions and 4 deletions
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2
drivers/bus/fsl-mc/mc-io.c
View File

@ -82,7 +82,7 @@ int __must_check fsl_create_mc_io(struct device *dev,
mc_io->portal_phys_addr = mc_portal_phys_addr;
mc_io->portal_size = mc_portal_size;
if (flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
spin_lock_init(&mc_io->spinlock);
raw_spin_lock_init(&mc_io->spinlock);
else
mutex_init(&mc_io->mutex);

4
drivers/bus/fsl-mc/mc-sys.c
View File

@ -251,7 +251,7 @@ int mc_send_command(struct fsl_mc_io *mc_io, struct fsl_mc_command *cmd)
return -EINVAL;
if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
spin_lock_irqsave(&mc_io->spinlock, irq_flags);
raw_spin_lock_irqsave(&mc_io->spinlock, irq_flags);
else
mutex_lock(&mc_io->mutex);
@ -287,7 +287,7 @@ int mc_send_command(struct fsl_mc_io *mc_io, struct fsl_mc_command *cmd)
error = 0;
common_exit:
if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
raw_spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
else
mutex_unlock(&mc_io->mutex);

2
include/linux/fsl/mc.h
View File

@ -339,7 +339,7 @@ struct fsl_mc_io {
* This field is only meaningful if the
* FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is set
*/
spinlock_t spinlock; /* serializes mc_send_command() */
raw_spinlock_t spinlock; /* serializes mc_send_command() */
};
};