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IB/ehca: Rework destroy_eq()

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The ibmebus_free_irq() function, which might sleep, was called with
interrupts disabled.  To fix this, make sure that no interrupts are
running by killing the interrupt tasklet.  Also lock the
shca_list_lock to protect against the poll_eqs_timer running
concurrently.

Signed-off-by: Alexander Schmidt <alexs@linux.vnet.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Alexander Schmidt 2009-12-09 10:11:04 -08:00 committed by Roland Dreier
parent 91d3f9bacd
commit 9420269428
3 changed files with 8 additions and 4 deletions
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1
drivers/infiniband/hw/ehca/ehca_classes.h
View file

@ -375,6 +375,7 @@ extern rwlock_t ehca_qp_idr_lock;
extern rwlock_t ehca_cq_idr_lock;
extern struct idr ehca_qp_idr;
extern struct idr ehca_cq_idr;
extern spinlock_t shca_list_lock;
extern int ehca_static_rate;
extern int ehca_port_act_time;

9
drivers/infiniband/hw/ehca/ehca_eq.c
View file

@ -169,12 +169,15 @@ int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
unsigned long flags;
u64 h_ret;
spin_lock_irqsave(&eq->spinlock, flags);
ibmebus_free_irq(eq->ist, (void *)shca);
h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
spin_lock_irqsave(&shca_list_lock, flags);
eq->is_initialized = 0;
spin_unlock_irqrestore(&shca_list_lock, flags);
spin_unlock_irqrestore(&eq->spinlock, flags);
tasklet_kill(&eq->interrupt_task);
h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
if (h_ret != H_SUCCESS) {
ehca_err(&shca->ib_device, "Can't free EQ resources.");

2
drivers/infiniband/hw/ehca/ehca_main.c
View file

@ -123,7 +123,7 @@ DEFINE_IDR(ehca_qp_idr);
DEFINE_IDR(ehca_cq_idr);
static LIST_HEAD(shca_list); /* list of all registered ehcas */
static DEFINE_SPINLOCK(shca_list_lock);
DEFINE_SPINLOCK(shca_list_lock);
static struct timer_list poll_eqs_timer;