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bus: mhi: host: Fix up null pointer access in mhi_irq_handler
The irq handler for a shared IRQ ought to be prepared for running
even now it's being freed. So let's check the pointer used by
mhi_irq_handler to avoid null pointer access since it is probably
released before freeing IRQ.
Fixes: 1227d2a20c
("bus: mhi: host: Move IRQ allocation to controller registration phase")
Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/1658459838-30802-1-git-send-email-quic_qianyu@quicinc.com
[mani: added fixes tag]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
parent
568035b01c
commit
acc5495bf7
@ -430,12 +430,25 @@ irqreturn_t mhi_irq_handler(int irq_number, void *dev)
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{
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struct mhi_event *mhi_event = dev;
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struct mhi_controller *mhi_cntrl = mhi_event->mhi_cntrl;
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struct mhi_event_ctxt *er_ctxt =
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&mhi_cntrl->mhi_ctxt->er_ctxt[mhi_event->er_index];
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struct mhi_event_ctxt *er_ctxt;
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struct mhi_ring *ev_ring = &mhi_event->ring;
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dma_addr_t ptr = le64_to_cpu(er_ctxt->rp);
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dma_addr_t ptr;
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void *dev_rp;
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/*
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* If CONFIG_DEBUG_SHIRQ is set, the IRQ handler will get invoked during __free_irq()
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* and by that time mhi_ctxt() would've freed. So check for the existence of mhi_ctxt
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* before handling the IRQs.
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*/
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if (!mhi_cntrl->mhi_ctxt) {
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dev_dbg(&mhi_cntrl->mhi_dev->dev,
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"mhi_ctxt has been freed\n");
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return IRQ_HANDLED;
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}
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er_ctxt = &mhi_cntrl->mhi_ctxt->er_ctxt[mhi_event->er_index];
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ptr = le64_to_cpu(er_ctxt->rp);
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if (!is_valid_ring_ptr(ev_ring, ptr)) {
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dev_err(&mhi_cntrl->mhi_dev->dev,
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"Event ring rp points outside of the event ring\n");
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