PCI: endpoint: pci-epf-vntb: Add check to detect 'db_count' value of 0

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epf_ntb->db_count value should be within 1 to MAX_DB_COUNT. Current code
only checks for the upper bound, while the lower bound is unchecked. This
can cause a lot of issues in the driver if the user passes 'db_count' as 0.

Add a check for 0 also. While at it, remove the redundant 'db_count'
assignment.

Fixes: e35f56bb03 ("PCI: endpoint: Support NTB transfer between RC and EP")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260407124421.282766-2-mani@kernel.org

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Manivannan Sadhasivam 2026-04-07 18:14:20 +05:30 • committed by Bjorn Helgaas

parent 4dcddc1c79

commit 33bd1ea748

1 changed files with 3 additions and 6 deletions

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drivers/pci/endpoint/functions/pci-epf-vntb.c

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