iommu/ipmmu-vmsa: Fix allocation in atomic context

When attaching a device to an IOMMU group with
CONFIG_DEBUG_ATOMIC_SLEEP=y:

    BUG: sleeping function called from invalid context at mm/slab.h:421
    in_atomic(): 1, irqs_disabled(): 128, pid: 61, name: kworker/1:1
    ...
    Call trace:
     ...
     arm_lpae_alloc_pgtable+0x114/0x184
     arm_64_lpae_alloc_pgtable_s1+0x2c/0x128
     arm_32_lpae_alloc_pgtable_s1+0x40/0x6c
     alloc_io_pgtable_ops+0x60/0x88
     ipmmu_attach_device+0x140/0x334

ipmmu_attach_device() takes a spinlock, while arm_lpae_alloc_pgtable()
allocates memory using GFP_KERNEL.  Originally, the ipmmu-vmsa driver
had its own custom page table allocation implementation using
GFP_ATOMIC, hence the spinlock was fine.

Fix this by replacing the spinlock by a mutex, like the arm-smmu driver
does.

Fixes: f20ed39f53145e45 ("iommu/ipmmu-vmsa: Use the ARM LPAE page table allocator")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 6cbd2bdb92ce..41eee3401f05 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -74,7 +74,7 @@ struct ipmmu_vmsa_domain {
         struct io_pgtable_ops *iop;
 
         unsigned int context_id;
-        spinlock_t lock;                        /* Protects mappings */
+        struct mutex mutex;                     /* Protects mappings */
 };
 
 static struct ipmmu_vmsa_domain *to_vmsa_domain(struct iommu_domain *dom)
@@ -600,7 +600,7 @@ static struct iommu_domain *__ipmmu_domain_alloc(unsigned type)
         if (!domain)
                 return NULL;
 
-        spin_lock_init(&domain->lock);
+        mutex_init(&domain->mutex);
 
         return &domain->io_domain;
 }
@@ -646,7 +646,6 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
         struct iommu_fwspec *fwspec = dev->iommu_fwspec;
         struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
         struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
-        unsigned long flags;
         unsigned int i;
         int ret = 0;
 
@@ -655,7 +654,7 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
                 return -ENXIO;
         }
 
-        spin_lock_irqsave(&domain->lock, flags);
+        mutex_lock(&domain->mutex);
 
         if (!domain->mmu) {
                 /* The domain hasn't been used yet, initialize it. */
@@ -679,7 +678,7 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
         } else
                 dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id);
 
-        spin_unlock_irqrestore(&domain->lock, flags);
+        mutex_unlock(&domain->mutex);
 
         if (ret < 0)
                 return ret;