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authorStefan Richter <stefanr@s5r6.in-berlin.de>2012-04-09 21:40:33 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-04-17 22:27:37 +0200
commit8a8c47364eef8595e05b5bf53352aa6f16784356 (patch)
tree6e033f3c8698111e0ad662907978409fc418cb2e /drivers/firewire
parentd713dfa708e14352cfb71342cf985d08fe14be95 (diff)
downloadlinaro-lsk-8a8c47364eef8595e05b5bf53352aa6f16784356.tar.gz
firewire: ohci: omit spinlock IRQ flags where possible
bus_reset_work() is only called from workqueue thread context. ohci_set_config_rom() and ohci_allocate_iso_context() perform GFP_KERNEL memory allocations, therefore they must be called with interrupts enabled. Hence these functions may disable and enable local IRQs without having to track IRQ state. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/ohci.c23
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index b66112da2a6..c1af05e834b 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -1823,7 +1823,6 @@ static void bus_reset_work(struct work_struct *work)
container_of(work, struct fw_ohci, bus_reset_work);
int self_id_count, generation, new_generation, i, j;
u32 reg;
- unsigned long flags;
void *free_rom = NULL;
dma_addr_t free_rom_bus = 0;
bool is_new_root;
@@ -1930,13 +1929,13 @@ static void bus_reset_work(struct work_struct *work)
}
/* FIXME: Document how the locking works. */
- spin_lock_irqsave(&ohci->lock, flags);
+ spin_lock_irq(&ohci->lock);
ohci->generation = -1; /* prevent AT packet queueing */
context_stop(&ohci->at_request_ctx);
context_stop(&ohci->at_response_ctx);
- spin_unlock_irqrestore(&ohci->lock, flags);
+ spin_unlock_irq(&ohci->lock);
/*
* Per OHCI 1.2 draft, clause 7.2.3.3, hardware may leave unsent
@@ -1946,7 +1945,7 @@ static void bus_reset_work(struct work_struct *work)
at_context_flush(&ohci->at_request_ctx);
at_context_flush(&ohci->at_response_ctx);
- spin_lock_irqsave(&ohci->lock, flags);
+ spin_lock_irq(&ohci->lock);
ohci->generation = generation;
reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
@@ -1990,7 +1989,7 @@ static void bus_reset_work(struct work_struct *work)
reg_write(ohci, OHCI1394_PhyReqFilterLoSet, ~0);
#endif
- spin_unlock_irqrestore(&ohci->lock, flags);
+ spin_unlock_irq(&ohci->lock);
if (free_rom)
dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
@@ -2402,7 +2401,6 @@ static int ohci_set_config_rom(struct fw_card *card,
const __be32 *config_rom, size_t length)
{
struct fw_ohci *ohci;
- unsigned long flags;
__be32 *next_config_rom;
dma_addr_t uninitialized_var(next_config_rom_bus);
@@ -2441,7 +2439,7 @@ static int ohci_set_config_rom(struct fw_card *card,
if (next_config_rom == NULL)
return -ENOMEM;
- spin_lock_irqsave(&ohci->lock, flags);
+ spin_lock_irq(&ohci->lock);
/*
* If there is not an already pending config_rom update,
@@ -2467,7 +2465,7 @@ static int ohci_set_config_rom(struct fw_card *card,
reg_write(ohci, OHCI1394_ConfigROMmap, ohci->next_config_rom_bus);
- spin_unlock_irqrestore(&ohci->lock, flags);
+ spin_unlock_irq(&ohci->lock);
/* If we didn't use the DMA allocation, delete it. */
if (next_config_rom != NULL)
@@ -2891,10 +2889,9 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
descriptor_callback_t uninitialized_var(callback);
u64 *uninitialized_var(channels);
u32 *uninitialized_var(mask), uninitialized_var(regs);
- unsigned long flags;
int index, ret = -EBUSY;
- spin_lock_irqsave(&ohci->lock, flags);
+ spin_lock_irq(&ohci->lock);
switch (type) {
case FW_ISO_CONTEXT_TRANSMIT:
@@ -2938,7 +2935,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
ret = -ENOSYS;
}
- spin_unlock_irqrestore(&ohci->lock, flags);
+ spin_unlock_irq(&ohci->lock);
if (index < 0)
return ERR_PTR(ret);
@@ -2964,7 +2961,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
out_with_header:
free_page((unsigned long)ctx->header);
out:
- spin_lock_irqsave(&ohci->lock, flags);
+ spin_lock_irq(&ohci->lock);
switch (type) {
case FW_ISO_CONTEXT_RECEIVE:
@@ -2977,7 +2974,7 @@ static struct fw_iso_context *ohci_allocate_iso_context(struct fw_card *card,
}
*mask |= 1 << index;
- spin_unlock_irqrestore(&ohci->lock, flags);
+ spin_unlock_irq(&ohci->lock);
return ERR_PTR(ret);
}