From: Emmanuel Grumbach emmanuel.grumbach@intel.com
commit 3b57a10ca14c619707398dc58fe5ece18c95b20b upstream.
Sometimes the register status can include interrupts that were masked. We can, for example, get the RF-Kill bit set in the interrupt status register although this interrupt was masked. Then if we get the ALIVE interrupt (for example) that was not masked, we need to *not* service the RF-Kill interrupt. Fix this in the MSI-X interrupt handler.
Cc: stable@vger.kernel.org Signed-off-by: Emmanuel Grumbach emmanuel.grumbach@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-)
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -1901,10 +1901,18 @@ irqreturn_t iwl_pcie_irq_msix_handler(in return IRQ_NONE; }
- if (iwl_have_debug_level(IWL_DL_ISR)) - IWL_DEBUG_ISR(trans, "ISR inta_fh 0x%08x, enabled 0x%08x\n", - inta_fh, + if (iwl_have_debug_level(IWL_DL_ISR)) { + IWL_DEBUG_ISR(trans, + "ISR inta_fh 0x%08x, enabled (sw) 0x%08x (hw) 0x%08x\n", + inta_fh, trans_pcie->fh_mask, iwl_read32(trans, CSR_MSIX_FH_INT_MASK_AD)); + if (inta_fh & ~trans_pcie->fh_mask) + IWL_DEBUG_ISR(trans, + "We got a masked interrupt (0x%08x)\n", + inta_fh & ~trans_pcie->fh_mask); + } + + inta_fh &= trans_pcie->fh_mask;
if ((trans_pcie->shared_vec_mask & IWL_SHARED_IRQ_NON_RX) && inta_fh & MSIX_FH_INT_CAUSES_Q0) { @@ -1943,11 +1951,18 @@ irqreturn_t iwl_pcie_irq_msix_handler(in }
/* After checking FH register check HW register */ - if (iwl_have_debug_level(IWL_DL_ISR)) + if (iwl_have_debug_level(IWL_DL_ISR)) { IWL_DEBUG_ISR(trans, - "ISR inta_hw 0x%08x, enabled 0x%08x\n", - inta_hw, + "ISR inta_hw 0x%08x, enabled (sw) 0x%08x (hw) 0x%08x\n", + inta_hw, trans_pcie->hw_mask, iwl_read32(trans, CSR_MSIX_HW_INT_MASK_AD)); + if (inta_hw & ~trans_pcie->hw_mask) + IWL_DEBUG_ISR(trans, + "We got a masked interrupt 0x%08x\n", + inta_hw & ~trans_pcie->hw_mask); + } + + inta_hw &= trans_pcie->hw_mask;
/* Alive notification via Rx interrupt will do the real work */ if (inta_hw & MSIX_HW_INT_CAUSES_REG_ALIVE) {