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firewire: ohci: Move code from the bus reset tasklet into a workqueue 

Code inside bus_reset_work may now sleep. This is a prerequisite to
support a phy from Texas Instruments cleanly. The patch to support this
phy will be submitted later.

Signed-off-by: Stephan Gatzka <stephan@gatzka.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stephan Gatzka 2011-07-25 22:16:24 +02:00 committed by Stefan Richter
parent 32ce38f403
commit 2d7a36e233
1 changed files with 10 additions and 8 deletions
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18
drivers/firewire/ohci.c
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@ -42,6 +42,7 @@
#include <linux/string.h> #include <linux/string.h>
#include <linux/time.h> #include <linux/time.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <linux/workqueue.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
#include <asm/page.h> #include <asm/page.h>
@ -226,7 +227,7 @@ struct fw_ohci {
__le32 *self_id_cpu; __le32 *self_id_cpu;
dma_addr_t self_id_bus; dma_addr_t self_id_bus;
struct tasklet_struct bus_reset_tasklet; struct work_struct bus_reset_work;
u32 self_id_buffer[512]; u32 self_id_buffer[512];
}; };
@ -859,7 +860,7 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
* *
* Alas some chips sometimes emit bus reset packets with a * Alas some chips sometimes emit bus reset packets with a
* wrong generation. We set the correct generation for these * wrong generation. We set the correct generation for these
* at a slightly incorrect time (in bus_reset_tasklet). * at a slightly incorrect time (in bus_reset_work).
*/ */
if (evt == OHCI1394_evt_bus_reset) { if (evt == OHCI1394_evt_bus_reset) {
if (!(ohci->quirks & QUIRK_RESET_PACKET)) if (!(ohci->quirks & QUIRK_RESET_PACKET))
@ -1713,9 +1714,10 @@ static u32 update_bus_time(struct fw_ohci *ohci)
return ohci->bus_time | cycle_time_seconds; return ohci->bus_time | cycle_time_seconds;
} }
static void bus_reset_tasklet(unsigned long data) static void bus_reset_work(struct work_struct *work)
{ {
struct fw_ohci *ohci = (struct fw_ohci *)data; struct fw_ohci *ohci =
container_of(work, struct fw_ohci, bus_reset_work);
int self_id_count, i, j, reg; int self_id_count, i, j, reg;
int generation, new_generation; int generation, new_generation;
unsigned long flags; unsigned long flags;
@ -1887,7 +1889,7 @@ static irqreturn_t irq_handler(int irq, void *data)
log_irqs(event); log_irqs(event);
if (event & OHCI1394_selfIDComplete) if (event & OHCI1394_selfIDComplete)
tasklet_schedule(&ohci->bus_reset_tasklet); queue_work(fw_workqueue, &ohci->bus_reset_work);
if (event & OHCI1394_RQPkt) if (event & OHCI1394_RQPkt)
tasklet_schedule(&ohci->ar_request_ctx.tasklet); tasklet_schedule(&ohci->ar_request_ctx.tasklet);
@ -2260,7 +2262,7 @@ static int ohci_set_config_rom(struct fw_card *card,
* then set up the real values for the two registers. * then set up the real values for the two registers.
* *
* We use ohci->lock to avoid racing with the code that sets * We use ohci->lock to avoid racing with the code that sets
* ohci->next_config_rom to NULL (see bus_reset_tasklet). * ohci->next_config_rom to NULL (see bus_reset_work).
*/ */
next_config_rom = next_config_rom =
@ -3239,8 +3241,7 @@ static int __devinit pci_probe(struct pci_dev *dev,
spin_lock_init(&ohci->lock); spin_lock_init(&ohci->lock);
mutex_init(&ohci->phy_reg_mutex); mutex_init(&ohci->phy_reg_mutex);
tasklet_init(&ohci->bus_reset_tasklet, INIT_WORK(&ohci->bus_reset_work, bus_reset_work);
bus_reset_tasklet, (unsigned long)ohci);
err = pci_request_region(dev, 0, ohci_driver_name); err = pci_request_region(dev, 0, ohci_driver_name);
if (err) { if (err) {
@ -3382,6 +3383,7 @@ static void pci_remove(struct pci_dev *dev)
ohci = pci_get_drvdata(dev); ohci = pci_get_drvdata(dev);
reg_write(ohci, OHCI1394_IntMaskClear, ~0); reg_write(ohci, OHCI1394_IntMaskClear, ~0);
flush_writes(ohci); flush_writes(ohci);
cancel_work_sync(&ohci->bus_reset_work);
fw_core_remove_card(&ohci->card); fw_core_remove_card(&ohci->card);
/* /*