github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 17:47:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

bus: mhi: host: pci_generic: Round up nr_irqs to power of two

Browse Source 
When an MHI device uses standard MSI, the PCI core requires the allocated
number of vectors to be a strict power of two. But devices will only ask
for the irqs they need, so they might not be properly aligned.

Make sure a power-of-2 number of vectors is requested.

Signed-off-by: Javier Achirica <jachirica@gmail.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Link: https://patch.msgid.link/CACixm21q7b_diEx5COZxVZm9EhZ0hnakM_WBjEWcCsznfWeniw@mail.gmail.com
This commit is contained in:
Javier Achirica 2026-04-03 12:30:03 +02:00 committed by Manivannan Sadhasivam
parent 254f49634e
commit 86f6dc05ea
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/bus/mhi/host/pci_generic.c
View File

@ -1189,7 +1189,8 @@ static int mhi_pci_get_irqs(struct mhi_controller *mhi_cntrl,
*/
mhi_cntrl->nr_irqs = 1 + mhi_cntrl_config->num_events;
nr_vectors = pci_alloc_irq_vectors(pdev, 1, mhi_cntrl->nr_irqs, PCI_IRQ_MSIX | PCI_IRQ_MSI);
nr_vectors = pci_alloc_irq_vectors(pdev, 1, roundup_pow_of_two(mhi_cntrl->nr_irqs),
PCI_IRQ_MSIX | PCI_IRQ_MSI);
if (nr_vectors < 0) {
dev_err(&pdev->dev, "Error allocating MSI vectors %d\n",
nr_vectors);