target/linux/layerscape/patches-5.4/701-net-0148-bus-fsl-mc-use-raw-spin-lock-to-serialize-mc-cmds.patch

   1 From 035546179039d430b32b2cace256552455abf061 Mon Sep 17 00:00:00 2001
   2 From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
   3 Date: Thu, 29 Aug 2019 11:39:45 +0300
   4 Subject: [PATCH] bus: fsl-mc: use raw spin lock to serialize mc cmds
   5
   6 Replace the spinlock that serializes the MC commands with a raw
   7 spinlock. This is needed for the RT kernel because there are MC
   8 commands sent in interrupt context.
   9
  10 Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
  11 ---
  12  drivers/bus/fsl-mc/mc-io.c  | 2 +-
  13  drivers/bus/fsl-mc/mc-sys.c | 4 ++--
  14  include/linux/fsl/mc.h      | 2 +-
  15  3 files changed, 4 insertions(+), 4 deletions(-)
  16
  17 --- a/drivers/bus/fsl-mc/mc-io.c
  18 +++ b/drivers/bus/fsl-mc/mc-io.c
  19 @@ -82,7 +82,7 @@ int __must_check fsl_create_mc_io(struct
  20         mc_io->portal_phys_addr = mc_portal_phys_addr;
  21         mc_io->portal_size = mc_portal_size;
  22         if (flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
  23 -               spin_lock_init(&mc_io->spinlock);
  24 +               raw_spin_lock_init(&mc_io->spinlock);
  25         else
  26                 mutex_init(&mc_io->mutex);
  27
  28 --- a/drivers/bus/fsl-mc/mc-sys.c
  29 +++ b/drivers/bus/fsl-mc/mc-sys.c
  30 @@ -251,7 +251,7 @@ int mc_send_command(struct fsl_mc_io *mc
  31                 return -EINVAL;
  32
  33         if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
  34 -               spin_lock_irqsave(&mc_io->spinlock, irq_flags);
  35 +               raw_spin_lock_irqsave(&mc_io->spinlock, irq_flags);
  36         else
  37                 mutex_lock(&mc_io->mutex);
  38
  39 @@ -287,7 +287,7 @@ int mc_send_command(struct fsl_mc_io *mc
  40         error = 0;
  41  common_exit:
  42         if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
  43 -               spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
  44 +               raw_spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
  45         else
  46                 mutex_unlock(&mc_io->mutex);
  47
  48 --- a/include/linux/fsl/mc.h
  49 +++ b/include/linux/fsl/mc.h
  50 @@ -340,7 +340,7 @@ struct fsl_mc_io {
  51                  * This field is only meaningful if the
  52                  * FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is set
  53                  */
  54 -               spinlock_t spinlock;    /* serializes mc_send_command() */
  55 +               raw_spinlock_t spinlock; /* serializes mc_send_command() */
  56         };
  57  };
  58